Finding the Fourth Proportional to 1,111.17, 1,666.52 and 525.84

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.17 : 1,666.52 = 525.84 : x
2. Step 2: Convert to fraction form
   1,111.17/1,666.52 = 525.84/x
3. Step 3: Cross multiply
   1,111.17x = 1,666.52 × 525.84
4. Step 4: Simplify right side
   1,111.17x = 876,320.25
5. Step 5: Solve for x
   x = 876,320.25/1,111.17
6. Step 6: Final answer
   x = 788.65